12
Repairs to sealed components
1
During repairs to sealed components, all electrical supplies
shall be disconnected from the equipment being worked upon
prior to any removal of sealed covers, etc. If it is absolutely
necessary to have an electrical supply to equipment during
servicing, then a permanently operating form of leak detection
shall be located at the most critical point to warn of a potentially
hazardous situation.
2
Particular attention shall be paid to the following to ensure
that by working on electrical components, the casing is not
altered in such a way that the level of protection is
affected. This shall include damage to cables, excessive
number of connections, terminals not made to original
specification, damage to seals, incorrect fitting of glands, etc.
Ensure that the apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded to the
point that they no longer serve the purpose of preventing the
ingress of flammable atmospheres. Replacement parts
shall be in accordance with the manufacturer’s specifications.
NOTE The use of silicon sealant can inhibit the effectiveness of
some types of leak detection equipment.
Intrinsically safe components do not have to be isolated prior to
working on them.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to
the circuit without ensuring that this will not exceed the
permissible voltage and current permitted for the equipment in
use.
